Circuit having a digital controller for operation of a synchronous T motor

US5912543A · kind A · utility

Assignee

• Deutsche Thomson-Brandt GmbH · DE

Inventors

• Peter Mahr · Cochem, DE
• Gerhard Reiner · Villingen-Schwenningen, DE

Key dates

• Filing date: Oct 18, 1996
• Grant date: Jun 15, 1999
• Expiry date: Oct 18, 2016

Classification

• Technology area (CPC H): Electricity
• CPC primary: H02P6/10
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

Electronic circuit having a digital controller operation of a synchronous motor. Precision motors for driving, for example, a video head drum in video recorders are normally designed as externally commutated synchronous motors. These motors are driven with square-wave voltages by a digital controller (CON), whose circuitry can easily be implemented. The object of the present invention is to specify an electronic circuit of the type mentioned initially for controlling a synchronous motor, which enables good synchronism and the motor to be operated with little electrical noise. This object is achieved in that the synchronous motor is driven by sinusoidal signals, a separate control signal from the controller (CON) influencing the amplitudes of the drive signals (U1, V1, W1). A regulating signal for regulating the synchronous motor is produced by a sensor (GE) which is arranged on the synchronous motor, which regulating signal produces a fixed phase relationship between rotor revolution and drive signals. The circuit can be implemented in a simple manner and manages without any digital/analogue converters. The applications which result are, in particular, for digital video recorders a…